Sounds like she was running away.

"A 14-year-old girl that had been missing for 10 days has been found, police said Monday night.
She was last seen at the Boulder High School football game on Sept. 30. Boulder police said she was found at a home in Thornton, just north of Denver, on Monday, Oct. 10."

https://www.msn.com/en-us/news..../crime/missing-14-ye